Carpenter&#39;s square.



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AUGUST KRAGE, 0F HERMON, CALIFORNIA.

CARPENTER@ SQUARE Specification of Letters Patent.

rammed nee. rarer@ Application led March 30, 1916. Serial No. 87,664.

To all whom/,it may concern: y

Be it known that ll, AUGUST KRAGE, a citizen of the United States, residing at Hermon, in the county of Los Angeles and State of California, have invented new and useful Improvements in Carpenters Squares, of whichthefollowing is a specication.

.This invention relates to an improved carpenters square and contemplates an extension straight edge andimproved means for securing said straight edge to one member of the square in alinement therewith and for readily disconnecting said straight edge from the square member as desired.

More particularly the invention comprises means for takingup wear of the engaging parts of the securing means `of the square member and extension straight edge, so that the extension straight edge may be held rigid to the square member when said parts become worn.

The invention is illustrated in the accompanying drawings which form a part of this specification, in which y f Figure 1 is a perspective view of the square and theextension straight edge secured to one member of the square. Fig. ,2 is a sectional view of one member of the square and the extension straight edge secured thereto, takenon line m2-2 of Fig. 1. Fig. 3 is a plan view of the under side of aportion of the square and extension straight edge secured to one of the square members as shown in Fig. 1, with said member broken away to show the securing element for securing the extension straight edgeto the square member. Fig-4 is a cross section of one member of the square, 'with the extension straight edge secured thereto, taken on; line aat-m41 of Fig. 3. Fig. 5 is a view of the securing tongue of the extension member. Fig. is a perspective view of the securing element for securing the extension straight edge to one of the square members.

The square comprises two members 1 and 2 arranged in the usual manner at right angles to each other, yand an` extension straight edge 3. rlhe member n1 is hollow and open at one end to receive' .a securing tongue 4f at one end ofthe extension straight edge 3. A shoulder 5 'is formed at the juncture of the end of Asaid straight edge and said tongue,l which shoulder f is adapted to abut against the end'of thesquare member 1,.

to limit theprojection ofv said tongue within said member and to aline the extension straight-edge with said square member. The side edges of the tongue 4f are adapted to tit the innersurface of the side walls of the squarel member 1 to hold the extension straight 'edge 3 rigidly in alinement with the side edges of the square member. The tongue 4 is provided with a T-shaped slot 6, extending,longitudinally at 7 from the end of the tongue and transversely of the tongue at 8.

- Within the square member 1 is pivoted a securing element comprising a lever l0, the square member being provided with a slot v11 to receive the lever and permit swinging movement thereof. Said lever comprises two members, an outer member 12 and an inner member 13, the outer member resting upon the inner member. Ears'il are formed on the side edges of member 12 and extend downwardly over the side edges of the member 13 and rest at the sides of a notch 1G formed in the under side of the lever member 13. A pivot pin 17 extends transversely through the solid parts 18 of the square member 1 through the ears 15 and notch 1G of lever member 13, whereby the lever 10 is 4pivoted to the square member 1 within the slot 11 thereof. Set screws 19 extend into the parts 18 of square member 1 and engage the pivot pin 17 to hold said pin in position in the square member. One end of the members of the lever 10 is enlarged, such enlargelment of the member 12 forming a thumb piece 20 to be engaged by the thumb of the user to depress said end of the lever. The

enlargement ofthe inner lever member 13 is provided with a slot 21, extending longitudinally of the lever member, into which`l slot projects a lug 22 from the upper lever member' 12. A screw 25 extends through the end of the enlarged portion of the lever member 13 into the enlargement slot 21 and Y is swiveledto the lug 22 so that upon turning the screw, the lever member 13 is adjusted llongitudinally with relation to the lever member 12, the notch 16 in the member 13 permitting the member to move over the pivot pin 17. kOn the end of the lever member 13, opposite the thumb piece 20, is formed a latch 30, said latch being adapted to lit within the portion 8 of the slot 6 in the straight edge tongue 4, and the latch end of said lever member being adapted to t within the portion 7 of said tongue slot, when said tongue extends within the square member 1, whereby the extension straight edge 3 secured to said square member, with the side edges of the tongue 4 in engagement with the inner side surfaces of the member 1 and the shoulder 5 of the straight edge 3, in engagement with the end edge of said square member, thus securing the straight edge' rigidly to the square member in alinement therewith.

Aat spring 35 secured to the under side of the square member l and counter-sunk Hush with the surface of the under side of the square member, extends into a slot 36 in the lower wall of the square memberand en-v gages the enlarged end of the lever member 13 to hold the lever 10 in its normal position within the square member and the latch 30 in engagement with the slot portion 8 in the straightedge tongue 4. An embossment 37 is formed on the lower side of the enlarged- -end of the lever member 13 below the4 screw ,25 to strengthen the metal of said enlarged end around said screw, said'embossment extending through a notch 38 in the end of spring 35, flush with the lower side of the spring and flush with the lower side of the square member 1, when the lever 10 is in its normal position. y

Any outward pull on the extension straight edge 3 will cause the latch 30 to engage the `shoulders 40 at one side of the slot portion 8 and prevent the tongue 4 from being pulled out of the square member 1, and the straight edge 3 Jr'rom being disengaged from said square member.

f The under side 41 of the latch 30 is beveled so lthat when the tongue 4 is introduced yinto the-member 1, said beveled under side will engage the endy of the tongue at the sides of the slot portion 7, which will cause the lever 1`0 to swing on its pivot 17 and allow the end of the tongue to pass under the latch until the .latch registers with the slot portion 8, whereupon the latch, under the influence of the spring 35 will snap into the slot portion 8 and the latch end of the lever into the slot portion 7, and lock' the extension straight edge to the square member 1 in proper alinement therewith.

Upon pressing the thumb piece/2() with his thumb, the user'may cause the lever 10 to swing on its pivot and disengage the latch from the shoulder 40 ofthe tongue, so that the straight edge may be withdrawn from the square member 1.

The pivot pin 7 engages the upper wall of the notch 16 whereby the lever member 13 is held in'4 position against the lever memben 12. When the engaging edge of the latch 30 and the shoulders 40 of the straight edgeI '-tongue 4 become worn, thel wear may be taken'up by turning the screw 25 so that the lea/fer mem-ber 13 and latch 30 may loe-moved.4 longitudinally with 4relation toI the"lever member"12 into such yposition that when the` straight edge shoulder 5 engages the end edges of the square member 1 and the sides of the tongue 4 engage the inner surfaces of the sides of the square member, the latch will engage the tongue shoulders 40 and hold the straight edge rigidly tothewsquare member l in alinement therewithwas before the wear of the parts took place.

The lever 10 may be, removed from the square member 1 upon loosening the set screws 19 and removing the pivot pin 17 from the lever. The portion of the spring 35 engaging the end of the lever melnber 13 is enlarged so as to engage substantially the entire surface ofthe enlarged end of the lever member to apply the necessary spring pressure tothe lever 10.

The square members 1 and 2 and the extension straight edge may be provided with graduations for. measuring, if desirable.

I claim:

1. In a carpenters square, a pair of square members, an extension straight edge, shoulders on said straight edge, a securing element on one of said square members, said securing element comprising a pair of lever members, one of said lever members being pivoted to said square member, the other lever member being carried by said first lever member, a latch on said second lever member adapted to engage said shoulders on said 95 straight edge to lock said straight edge to said square member yin alinement therewith, and means for adjusting said second lever member with relation to said first lever member to take uphyvear in said shoulders and 100 said latch.

.of said notch to hold the second lever member against said irst lever member, a latch on said second lever memberv for engaging said shoulders to lock said straight edge to said square member in alinement therewith and means for adjusting said second lever member to 'take up wear in said shoulders andsaid latch, said notch permittin such relative adjustment of said lever mem ers.

y3. In a carpenters square, a pair of square members, an extension straight edge, shoulders on said straight edge, a securing element comprising a pair of lever members, one of said lever members being pivoted to 12E one of said square members, the other lever member being carried by said first lever member, a latch onsaid second lever member one of said square members in alinement therewith, a lug onone of said lever members, a screw extending through a portion oi the other lever member, said screw being swiveled to said lug so that'upon turningv said screw, said second lever member may be adjusted to take up wear in the latch and said shoulders.

4. In a carpenters square, a pair of square members, an extension straight edge, shoulders on. said straight edge, a securing element comprising a pair of lever members, one of ysaid lever members being pivoted to one of said square members, the other lever member being. carried .by said first lever member, a latch onone end of said second lever member for engaging said shoulder toloclr said straight edge to one of said square members to hold said straight edge in alinement with said square members, the other end ofsaid second lever member being provided with a longitudinall slot,a lug projecting from said first lever member into said slot, a screw extending through the slot end oll said lever. member and swiveled to said lug for adjusting p said second lever ,member and latch to take up wear in'said lflatch and said shoulders. v

5.. ln a `"carpenters square, a pair of square members, an extension straight edge, shoulders on said straight edge, a securing element in one of said square members, said securing element comprising a pair of lever vmembers7 a pivot pin in said square member for pivoting one of said lever members to said square member, set screwsv for holding said pivot pin in said square member, a latch on one end of the other lever member for engaging said shoulders to lock said straight edge to said lsquare member in alinement therewith, a screw" extending into the end of one of said`lever members, `a lug on the other lever member to -Awhiehysaid screw is swiveled, said screw being adapted to adjust -said latch lever member withl relation tothe other lever member to\ taire up wear in said latch and said shoulders. "l,

In testimony whereof I have lsigned my name to this specification. i

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